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This week's questions

How are ants able to survive for a long time when kept in a tightly capped bottle?

G. Venkateshan, Chennai

When an electric bulb is kept switched on, the glass becomes hot but it is not so in the case of a tube lamp. Why?

K. Ananthanarayanan, Kanyakumari, Tamil Nadu

Why does fresh tamarind become dark in colour after some months, but not when stored in air-conditioned godowns?

N. Parthasarathy, Chennai

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